Please help!!!!!!!!!!!!!?

Answer:

L² =(3--6)²+5--4)

L²=9²+9²

L²=162

L=12.73

Answer:

A 24..............................

Answer:

a)

The point estimate is 0.368.

The 95 percent confidence interval for the proportion of all U.K. television ads that use humor is (0.321, 0.415).

b)

The point estimate is 0.262.

The 95 percent confidence interval for the proportion of all U.S. television ads that use humor is (0.222, 0.302).

c)

Yes, because the lower bound of the confidence interval for UK proportions is higher than the upper bound of the confidence interval for US proportions.

Step-by-step explanation:

(a) Suppose that a random sample of 400 television ads in the United Kingdom reveals that 147 of these ads use humor.

In a sample with a number n of people surveyed with a probability of a success of [tex]\pi[/tex], and a confidence level of [tex]1-\alpha[/tex], we have the following confidence interval of proportions.

[tex]\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]

In which

z is the zscore that has a pvalue of [tex]1 - \frac{\alpha}{2}[/tex].

Sample of 400:

This means that [tex]n = 400[/tex]

Point estimate:

[tex]\pi = \frac{147}{400} = 0.368[/tex]

The point estimate is 0.368.

95% confidence level

So [tex]\alpha = 0.05[/tex], z is the value of Z that has a pvalue of [tex]1 - \frac{0.05}{2} = 0.975[/tex], so [tex]Z = 1.96[/tex].

The lower limit of this interval is:

[tex]\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.368 - 1.96\sqrt{\frac{0.368*0.632}{400}} = 0.321[/tex]

The upper limit of this interval is:

[tex]\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.368 + 1.96\sqrt{\frac{0.368*0.632}{400}} = 0.415[/tex]

The 95 percent confidence interval for the proportion of all U.K. television ads that use humor is (0.321, 0.415).

(b) Suppose a random sample of 455 television ads in the United States reveals that 119 of these ads use humor.

Sample of 455:

This means that [tex]n = 455[/tex]

Point estimate:

[tex]\pi = \frac{119}{455} = 0.262[/tex]

The point estimate is 0.262.

95% confidence level

So [tex]\alpha = 0.05[/tex], z is the value of Z that has a pvalue of [tex]1 - \frac{0.05}{2} = 0.975[/tex], so [tex]Z = 1.96[/tex].

The lower limit of this interval is:

[tex]\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.262 + 1.96\sqrt{\frac{0.262*0.738}{455}} = 0.222[/tex]

The upper limit of this interval is:

[tex]\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.262 + 1.96\sqrt{\frac{0.262*0.738}{455}} = 0.302[/tex]

The 95 percent confidence interval for the proportion of all U.S. television ads that use humor is (0.222, 0.302).

(c) Do the confidence intervals you computed in parts a and b suggest that a greater percentage of U.K. ads use humor?

Yes, because the lower bound of the confidence interval for UK proportions is higher than the upper bound of the confidence interval for US proportions.

Answer:

9n?

Step-by-step explanation:

i think its 9n its been a while ok

Answer:

9 x n

Step-by-step explanation:

The ¨product¨ is the answer to a multiplication problem, so that requires you to multiply 9 and n.

Answer:

D) x = 8

Step-by-step explanation:

The information given states that ABCD is similar to RSTU.

Line BC is similar to Line ST. ST is 2 times larger that BC.

Line AB is similar to Line RS. RS must be 2 times larger than AB as well, so multiply 4 x 2 to get x = 8.

Hope it helps!!!

what kind math is it?

Answer:

13 out of 16 (13/16)

Step-by-step explanation:

Add all of the items together.

5 stress balls + 3 notepads + 2 gift cards + 6 sticky notes = 16 items

So, now you have to find the probability out of 16.

Since there are 5 stress balls and 2 gift cards, there is a 5 out of 16 chance of passing out stress balls(5/16) and a 2 out 16 chance of handing out gift cards(2/16)

So, she has a 3 out 16 chance of handing out stress balls more than gift cards.

hope this helps and makes sense:)

Answer:

852 students walking to school

Step-by-step explanation:

Lets start with a simple example so you can get it

if 60% of 100 students walk to school that means

60 students walk to school... right??

so lets simplify it more that means you have multiplied 100 (students) by 60%

or [tex]\frac{60}{100}[/tex]  (note: you can say that 60% is equal to [tex]\frac{60}{100}[/tex] )

so the problem told 60% of 1420 students walk to school that means we should

do this:     [tex]1420*\frac{60}{100} = 852[/tex]

Answer:

852 walk to school

Step-by-step explanation:

i got this because i divided the 1420 into 10 which became a 142, multiply by 6 and you get 852

also you could

it is really simple also, all you have to do is multiply the number of student, S times the precent of students who walk, so s times w, which is 60 precent turend into .6 precent so 1420 x .6

Answer:

orbit

Step-by-step explanation:

Answer:

go everything youve learnt from grade 3 come right up

Step-by-step explanation:

sometimes its knowing the simply formulas thatll get you through

9514 1404 393

Answer:

  £592 for 16 boxes

Step-by-step explanation:

The classroom floor area is ...

  A = LW = (8.8 m)(2.2 m) = 19.36 m²

The cupboard floor area is ...

  A = (2.3 m)(2.1 m) = 4.83 m²

Then the total area to be covered is ...

  19.36 m² +4.83 m² = 24.19 m²

At 1.6 m² per box, the number of boxes required is ...

  (24.19 m²)/(1.6 m²/box) = 15.12 boxes

If we assume we can only purchase whole boxes, we need to purchase 16 boxes to cover the floor. The cost will be ...

  (16 boxes)(£37/box) = £592 . . . . cost of laminate to replace the floor

Answer:

~77°

Step-by-step explanation:

cosQ = 9/40

inverse cosine(9/40) ≈ 77° = Q

Answer:

width = 4

Step-by-step explanation:

864 = 27 x 8 x w

w = 4

Answer:

Step-by-step explanation:

VZ = 44-27.5 = 16.5

ZY/VY = ⅝

WX = ⅝ of VX

VX = 36×8/5 = 57.6

VW = VX - WX = 21.6 units

9514 1404 393

Answer:

  not a right triangle

Step-by-step explanation:

These lengths will form a triangle iff ...

  10 + 20 > 30 . . . . . false

These side lengths do not form a triangle. It is NOT a right triangle.

_____

Additional comment

We notice the differences between these numbers are the same: 10. The only right triangle with side lengths having the same difference is some multiple of a 3-4-5 right triangle. For a right triangle with side lengths having a difference of 10, the sides would have to be 30, 40, 50--not 10, 20, 30.

Answer:

18 ÷ (1/2 - 1/3) eqauls 108

if you click the image it will show you how to solve the equation. I hope this helps you.

Answer: Only C

Step-by-step explanation:

8.4 + 9.7 = 18.1

18.1 > 15.5 so it is a scalene triangle

Answer:

0.8125 = 81.25% probability that she or he used the lab on a regular basis.

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

[tex]P(B|A) = \frac{P(A \cap B)}{P(A)}[/tex]

In which

P(B|A) is the probability of event B happening, given that A happened.

[tex]P(A \cap B)[/tex] is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Student got an A

Event B: Went to the lab on a regular basis

Probability of a student getting an A:

65% of 40%(go to the lab on a regular basis).

10% of 100 - 40 = 60%(don't go to the lab on a regular basis).

So

[tex]P(A) = 0.65*0.4 + 0.1*0.6 = 0.32[/tex]

Probability of getting an A and going to the lab on a regular basis:

65% of 40%. So

[tex]P(A \cap B) = 0.65*0.4 = 0.26[/tex]

Determine the probability that she or he used the lab on a regular basis.

[tex]P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0.26}{0.32} = 0.8125[/tex]

0.8125 = 81.25% probability that she or he used the lab on a regular basis.

1/3 hope this help you

Step-by-step explanation:

can i get a heart

Answer:

48

Step-by-step explanation: surface area = 2 (lw + hl + hw)

2 ( 2 x2 + 5x2 + 5x2)

2 (4+10+10)

2(24)

48 cm

Step-by-step explanation:

Answer:

          WHAT THE OTHER PERSON SAID

Step-by-step explanation:

Answer:

H0: Ud >= 0

H1: UD < 0

Step-by-step explanation:

We have the sample size = 81

Mean of x = 107

The alpha level was not given for me to help you calculate further.

This researcher wants to know if increasing reading speed brings about a decrease in the comprehension of the reader.

The hypothesis are

Null hypothesis

H0: U >= 0

Alternative hypothesis

H1: U < 0

Thank you

Answer:

x = 1.71

Step-by-step explanation:

[tex]x^3-20=-15\\x^3=-15+20\\x^3=5\\\sqrt[3]{x^3} =\sqrt[3]{5} \\x=1.71[/tex]

Answer:

1 2/3

Step-by-step explanation:

3x-20= -15

   +20   +20

3x = 5

= 1 2/3

Hope This Helps!

Answer:

40%

Step-by-step explanation:

8/20 times 5 = 40/100 = 40%

Answer:

We can assure the Ann Arbor officials that after look the information we conclude that the mean is 8 h

Step-by-step explanation:

From CI ( 95 % )  = ( 6,7 ; 9,3 )

And the information "large random size sample" we conclude that the population has a normal distribution; a normal distribution has a bell shape curve, and data must spread symmetrically with respect to the mean, therefore the mean is:

6,7 + 9,3 = 16

16/2 = 8

If we need t check we can use the other CI

CI ( 99 % ) = (6,257 , 9,743 )

6,257 + 9,743 = 16

16/2 = 8

We are sure the mean is 8 h